Question

Convert arrays.py to Java.

‘’’’’’

File: arrays.py

An Array is like a list, but the client can use

Only [], len, iter, and str.

To instantiate, use

<variable> = Array(<capacity>, <optional fill value>)

The fill value is None by default.

‘’’’’’

class Array(object):

‘’’’’’Represents an array.’’’’’’

def__init__(self, capacity, fillValue = None):

               ‘’’’’’Capacity is the static size of the array.

               fillValue is place at each position.’’’’’’

               self.items = list()

               for count in range(capacity):

               self.items.append(fillValue)

def__len__(self):

               ‘’’’’’->The capacity of the array.’’’’’’

               return len(self.items)

def__str__(self):

               ‘’’’’’->The string representation of the array.’’’’’’

               return str(self.items)

def__iter__(self):

               ‘’’’’’Supports traversal with a for loop.’’’’’’

               return iter(self.items)

def__getitem__(self, index):

               ‘’’’’’Subscript operator for access at index.’’’’’’

               return self.items[index]

def__setitem__(self, index, newItem):

               ‘’’’’’Subscript operator for replacement at index.’’’’’’

               self.items[index] = newItem

Answer 1

Program in java is given below:

import java.util.*;
import java.util.Arrays;
class Array {
String fillval="None";
String items[];
  
public Array(int capacity,String fillval) {
int x=capacity;
items=new String[capacity];
for(int count=0;count<capacity;count++)
{
items[count]=fillval;
  
}
}
public Array(int capacity) {
int x=capacity;
items=new String[capacity];
for(int count=0;count<capacity;count++)
{
items[count]=fillval;
  
}
  
}
public int len(){
return items.length;
}
public String str()
{
return Arrays.toString(items);
}
public String iter(int index)
{
return items[index];
}
public String getitem(int index)
{
return items[index];
}
void setitem(int index,String newi)
{
  
items[index]=newi;
}
}
public class example{
public static void main(String[] args) {
Array a = new Array(5);
System.out.println(a.len());
a.setitem(1,"2");
System.out.println(a.str());
System.out.println(a.iter(2));
System.out.println(a.getitem(0));
}
}

Output:

 5 [None, 2, None, None, None] None None